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Interferometric investigations of eclipsing binary Del Ori as a key to an improved distance scale. K.Shabun ESO, A.Richichi ESO, U.Munary INAF, A.Siviero INAF, B.Paczynski Princeton University. Project description. Double-lined eclipsing binaries AMBER VLTI Angular diameters and separation - PowerPoint PPT Presentation
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Interferometric Interferometric investigations of investigations of
eclipsing binary Del eclipsing binary Del Ori as a key to an Ori as a key to an improved distance improved distance
scalescaleK.Shabun ESO, A.Richichi ESO,K.Shabun ESO, A.Richichi ESO,
U.Munary INAF, A.Siviero INAF,U.Munary INAF, A.Siviero INAF,
B.Paczynski Princeton UniversityB.Paczynski Princeton University
Project descriptionProject description Double-lined eclipsing Double-lined eclipsing
binariesbinaries AMBER VLTIAMBER VLTI Angular diameters and Angular diameters and
separationseparation Effective temperatures Effective temperatures Wilson-Devinney methodWilson-Devinney method Global calibration of Global calibration of
eclipsing binaries as eclipsing binaries as distance indicatorsdistance indicators
Contribution to the effective Contribution to the effective temperature scale for hot temperature scale for hot starsstars
ObjectObject Object: Del OriObject: Del Ori V=2.2, J=2.7, H=2.9, K=3.0V=2.2, J=2.7, H=2.9, K=3.0 SpType: O9.5II-III+B0SpType: O9.5II-III+B0 Period: 5.732476 daysPeriod: 5.732476 days DiamA ~ 0.9 mas, DiamB ~ DiamA ~ 0.9 mas, DiamB ~
0.6 mas0.6 mas Separation ~ 2.5 – 3.0 masSeparation ~ 2.5 – 3.0 mas Distance: 280 pcDistance: 280 pc Calibrator: 51 OriCalibrator: 51 Ori J=2.9, H=2.3, K=2.2J=2.9, H=2.3, K=2.2
ObservationsObservations Project ID: 078.D-0189(B) Project ID: 078.D-0189(B) Object: Del OriObject: Del Ori Calibrator: 51 OriCalibrator: 51 Ori Timing: 4 observations at the times of Timing: 4 observations at the times of
maximal separation (6 h total)maximal separation (6 h total) First set of frames: 31 December 2006First set of frames: 31 December 2006 AMBER configuration: U1 – U3 – U4AMBER configuration: U1 – U3 – U4 Bands: J, H, KBands: J, H, K Low resolution modeLow resolution mode
Seeing Seeing
Data reductionData reduction
GasganoGasgano amber_ascii_exportamber_ascii_export Frame selection by SNR (20% of the Frame selection by SNR (20% of the
best frames)best frames) Only one calibrator is availableOnly one calibrator is available Uncertainty with TF: more Uncertainty with TF: more
calibrators neededcalibrators needed
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
U1-U3 U3-U4 U4-U1
Transfer function in H and Transfer function in H and KK
Calibrated squared Calibrated squared visibilities invisibilities in
H and KH and K
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
1.56 1.59 1.62 1.65 1.68 1.71 1.74 1.77 1.8 1.83 1.86 1.96 1.99 2.03 2.06 2.09 2.13 2.16 2.19 2.23 2.26 2.29 2.33 2.36 2.39 2.43 2.46 2.49
Vis^2
U1-U3 U3-U4 U4-U1
Model fittingModel fitting
Parameters: DiamA, DiamB, Parameters: DiamA, DiamB, Separation, PASeparation, PA
Grid approachGrid approach Two uniform disk modelTwo uniform disk model One minimum is already foundOne minimum is already found Good match with the previous Good match with the previous
observationsobservations
Preliminary fitting:Preliminary fitting:
cutting the edgescutting the edges
0
0.2
0.4
0.6
0.8
1
1.2
1.56
1.62
1.68
1.74
1.80
1.86
1.99
2.06
2.13
2.19
2.26
2.33
2.39
2.46
U1-U3 U3-U4 U4-U1
Preliminary fitting:Preliminary fitting:
DiamA: 0.9 DiamB: 0.6 Sep: 2.8 PA: 0 DiamA: 0.9 DiamB: 0.6 Sep: 2.8 PA: 0
0
0.2
0.4
0.6
0.8
1
1.2
1.56
1.59
1.62
1.65
1.68
1.71
1.74
1.77
1.80
1.83
1.86
1.96
1.99
2.03
2.06
2.09
2.13
2.16
2.19
2.23
2.26
2.29
2.33
2.36
2.39
2.43
2.46
2.49
U1-U3 U3-U4 U4-U1 M 1-3 M 3-4 M 4-1
Preliminary fitting:Preliminary fitting:
DiamA: 0.9 DiamB: 0.6 Sep: 2.8 PA: 75DiamA: 0.9 DiamB: 0.6 Sep: 2.8 PA: 75
0
0.2
0.4
0.6
0.8
1
1.2
1.56
1.59
1.62
1.65
1.68
1.71
1.74
1.77
1.80
1.83
1.86
1.96
1.99
2.03
2.06
2.09
2.13
2.16
2.19
2.23
2.26
2.29
2.33
2.36
2.39
2.43
2.46
2.49
U1-U3 U3-U4 U4-U1 M 1-3 M 3-4 M 4-1
Preliminary fitting:Preliminary fitting:
DiamA: 0.9 DiamB: 0.6 Sep: 2.8 PA: 128DiamA: 0.9 DiamB: 0.6 Sep: 2.8 PA: 128
0
0.2
0.4
0.6
0.8
1
1.2
1.56
1.59
1.62
1.65
1.68
1.71
1.74
1.77
1.80
1.83
1.86
1.96
1.99
2.03
2.06
2.09
2.13
2.16
2.19
2.23
2.26
2.29
2.33
2.36
2.39
2.43
2.46
2.49
U1-U3 U3-U4 U4-U1 M 1-3 M 3-4 M 4-1
Piston plotsPiston plots
VLTI NIGHT REPORT - 2007-03-06VLTI NIGHT REPORT - 2007-03-06
OB ID: 248151 Program ID: 078.D-0189(B) OB Name:CAL_51ori_2OB ID: 248151 Program ID: 078.D-0189(B) OB Name:CAL_51ori_2======================================*** Instrument : AMBER*** Instrument : AMBER*** *** Target : 51oriTarget : 51ori*** Classification : A)Fully within specifications*** Classification : A)Fully within specifications*** Comments on this OB : OPD drifts making the fringe tilted during exposures *** Comments on this OB : OPD drifts making the fringe tilted during exposures However no scan rejected by the pipeline, data OKHowever no scan rejected by the pipeline, data OK*** Time Started: 00:36*** Time Started: 00:36*** Time Finished: 01:12*** Time Finished: 01:12
OB ID: 248156 Program ID: 078.D-0189(B) OB Name:SCI_delori_2OB ID: 248156 Program ID: 078.D-0189(B) OB Name:SCI_delori_2==========================================*** Instrument : AMBER*** Instrument : AMBER*** *** Target : deloriTarget : delori*** Classification : B)Mostly within specifications*** Classification : B)Mostly within specifications*** Comments on this OB : Problem with guiding since the IRIS FOV shows a *** Comments on this OB : Problem with guiding since the IRIS FOV shows a binary with around 300 mas separation with a flux ratio of ~5 which is not binary with around 300 mas separation with a flux ratio of ~5 which is not shown in the FC (totally bloomed). We considered the brightest component is the shown in the FC (totally bloomed). We considered the brightest component is the science object. Problem: speckles of the faint companion are injected into science object. Problem: speckles of the faint companion are injected into AMBER. Moreover, the coordinates of the bright companion is unknown, and the AMBER. Moreover, the coordinates of the bright companion is unknown, and the OPD drifted quickly. Difficult to keep them vertical. Data reduction shows a OPD drifted quickly. Difficult to keep them vertical. Data reduction shows a good visibility on a baseline, a very faint on the other one, nothing on the good visibility on a baseline, a very faint on the other one, nothing on the 3rd.3rd.*** Time Started: 01:14*** Time Started: 01:14*** Time Finished: 02:08*** Time Finished: 02:08
